It's a first-of-its-kind test of a maneuver that might one day save the world. A NASA spacecraft will slam into a small, harmless asteroid to try to change its orbit.
NASA insists there’s a zero chance either asteroid will threaten Earth — now or in the future. That’s why the pair was picked.Johns Hopkins took a minimalist approach in developing Dart — short for Double Asteroid Redirection Test — given that it’s essentially a battering ram and faces sure destruction. It has a single instrument: a camera used for navigating, targeting and chronicling the final action.
Unless Dart misses — NASA puts the odds of that happening at less than 10% — it will be the end of the road for Dart. If it goes screaming past both space rocks, it will encounter them again in a couple years for Take 2.Little Dimorphos completes a lap around big Didymos every 11 hours and 55 minutes. The impact by Dart should shave about 10 minutes off that. Although the strike itself should be immediately apparent, it will take months to verify the moonlet’s tweaked orbit.
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